Method of manufacturing multipart glass articles



Jan. 11, 1938 w. P. ZIMMERMAN ET AL 11 9 METHOD OF MANUFACTURING MULTIPART GLASS ART ICLES Filed May 20, 1936 v EIE- 3- \ALRZimmarman MKl-Iu 1m 2 5.

IN VEN TORS BY M 1w7 ATTORNEK.

Patented Jan. 11, 1938 I UNITED STATES PATENT OFFIC METHOD OF MANUFACTURING MULTIPART GLASS ARTICLES Willard lP. Zimmerman and Minot K. Holmes, Muncie, llnd., assignors to Owens-Illinois Glass Company, a corporation of Uhio Application May 20, 1936, Serial No. 80,826

1 Claim. (m. 49-82) The present invention relates to improvements Fig. 4 is a fragmentary detail sectional view of in methods of manufacturing multi-part glass art e a sembled block. ticles and is particularly concerned with the pro- Fig. 5 is a detail perspective View the duction of hollow hermetically sealed building p te o blocks. While the present methodmay well be employed 5 An object of the present invention is the conn the manufacture of various multi-part glass struction of a hollow glass building block from articles, it is illustrated herein in connection with molded sections which are united while hot by a the production of hermetically sealed hollow glass glass-to-glass bond. To this nd the bl k is building blocks. The block disclosed is of rec- ,10 formed from molded Sections which may b tangular form and consists of two cup-like secunited prior to any great loss of the heat present s 5 0 ha es c of which is Produced O in the glass at the completion of the molding opa a ed qua y of molten glass which is eration. posited in a suitable mold 23 and pressed to the Another object of the present invention is the desired Shape by means of a plun e 5 provision of a novel and improved method for Each section includesabottom wall 25 and ineffecting a glass-to-glass bond between ld d terconnected side walls 25 said bottom wall proglass parts which when assembled, produce a hol- Viding e p s face of the 00mpieted blocklow building block or other article. To this end In the e y of a block, two Sections 35 have the invention contemplates, in so far as the their free edge portions 29 bonded together to' manufacture of a hollow building block is conpr vide a hermetically sealed j int 2. 20 cerned, the molding of sections to be united and A glas -mem s nd between t d p a localized application of intense heat to certain tions 29 of the block sections may be obtained by surface areas whereby such areas are rendered uniting e Sections immediately after their 'sufficiently plastic to insure adhesion thereof to IIIOVal from the mold and while Still sllflieiehtly 2.3 each other upon assembly. hot and plastic to adhere to each other under A further object is the provision f nove1 pressure or by a localized application of intense method of manufacturing hollow building blocks t at the e po t o s Which l ender the in which certain edge portions of block sections t sufficiently Plasticto insure adhesion of to be united, are brought t th desired tempera these portions to each other when the halves are :30 ture and degree of plasticity by dipping them into brought together under such localized 30 a molten bath of material which will not adhere heating y we he and Pr ab y S Obtained t0 the glass u Will operate eiiectively t bring by dipping said edgeportions into a bath of about the necessary conditions in the glass t molten material which will not adhere to the glass and in proximity to those areas which are to be and is of sumciently high temp u o render bonded together. 1 u said edge portions quite plastic. The tempera- It is also an object to provide a method faciliture of this bath may y through a mparat t ng rapid heating of a localized area of glass tively wide range being dependent entirely upon block sections without the necessity for excesthe melting Point of the Particular glass which sively heating the remaining portions. Thus, Varies as the batch formula is chahgeci- The warpage and cracking of the block sections may molten. material 26 may for example, be lead con- 40 be avoided. tained in a trough 21, the latter including supother ob'ects will be i t ports 28 upon which the block sections rest with part pointd out. n par apparent? and n their edge portions projecting into the bath. It

has been found that such a method of heating or reheating these edgeportions very quickly brings about the desired condition in these areas without greatly affecting the temperature of the remain- In the drawing:

Fig.- 1 is a fragmentary sectional view illustrating an initial step in the molding of one seet10n of hollow glass fing portions of the block sections.

Flg. 2 1s a fragmentary sectlonal v1ew illustrat- Upon obtaining sufiicient heating of these mg the su din st p which the surface areas edge portions, the block sections are removed 50 o be d, r heated y being, pp into a and placed one upon the other in a form 30 bebath of molten material. neath a pressure head 3! or. block as generally Fig. 3 is an elevational view illustrating the shown in Fig. 3. The assembled block rapidly final assembly operation in which the two block cools to the point where an effective glass-tosections are brought together under pressure. glass bond is produced The unit is then placed 55 in an annealing leer wherein strains and stresses are removed from the structure and the block gradually cooled. Such cooling of the block, inasmuch as a hermetic seal has been effected, greatly reduces the internal air pressure so that a partial vacuum is produced. Thus a structure is obtained in which no moisture will collect so long as the sections remain hermetically sealed together.

Modifications may be resorted to within the spirit and scope of the appended claim. 7

We claim:

The method of effecting a glass-to-glass bond between molded glass parts which consists in dipping only those surfaces to be united and surfaces in close proximity thereto into a bath of molten material which will not adhere to the glass yet will render said surfaces semi-plastic and capable of adhesion to each other and bringing these surfaces together under pressure while still semi-plastic.

WILLARD P. ZIMMERMAN. MINOT K. HOLMES. 

